Check it before you post it.
Free tools for YouTube, Instagram and TikTok creators. See your thumbnail next to other videos, keep text clear of the app's buttons, and fit every caption to each platform's limits.
Images and videos are processed in your browser. Nothing is uploaded.
All tools, free
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Image
Thumbnail preview
See your thumbnail and title in a mock video feed on desktop and mobile, in the sidebar and in search. Squint and grayscale tests show whether it still reads at a glance.
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Image
Thumbnail resizer
Turn any image into a 16:9 thumbnail at 1280 × 720, 1920 × 1080 or 4K, and compress it under the 2 MB phone upload limit without guessing quality settings.
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Video
Safe zone checker
Lay the button and caption areas of Shorts, Reels and TikTok over your vertical video, so faces and text stay where people can see them.
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Text
Caption length checker
Count characters and hashtags against the limits for YouTube, Instagram, TikTok, X, LinkedIn and Threads, and see exactly where "more" cuts your caption off.
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AI
Caption writer
Describe your post and get three caption options, hashtags and title ideas in English, Hinglish, Hindi and more.
Thumbnail preview
Upload a thumbnail and type your title to see how it looks next to other videos, at the sizes people actually see it.
Thumbnails that work at a glance
Most viewers see your thumbnail on a phone while scrolling, often smaller than a business card. One clear subject, a few large words at most, and strong contrast between the subject and the background usually beat a busy collage.
Turn on the squint test. If you can still tell what the video is about when it's blurry, the thumbnail will hold up in a crowded feed. Grayscale shows whether your contrast comes from brightness or only from color.
Thumbnail resizer
Make any image a 16:9 thumbnail at the right size, then compress it to the highest quality that fits under 2 MB.
Drag the preview to choose what stays in frame.
The 2 MB limit applies when you upload from the phone app. Uploads from a computer allow bigger files.
- Dimensions
- 1280 × 720
- File size
- None yet
- JPG quality
- None yet
Thumbnail size and file limits
Thumbnails display at 16:9. 1280 × 720 is the long-standing standard and stays under the 2 MB limit for uploads from a phone. YouTube has started accepting larger 4K thumbnails uploaded from a computer, which can look sharper on TVs.
"Blurred edges" is useful for vertical photos and screenshots: the full image stays visible, and the sides fill with a soft, blurred copy instead of black bars.
Safe zone checker
Lay the app's buttons and caption area over your vertical video or cover image, so faces, text and products stay visible.
Zones are approximate. App layouts change with updates and differ between phones, so leave a little extra room.
Why safe zones matter
Vertical feeds put your username, caption, audio label and a column of buttons on top of your video. Anything important under them, like a face, a price or on-screen text, gets hidden for every viewer.
Keep key moments inside the outlined area, and put on-screen text in the upper middle, where no app places its controls.
Caption length checker
Paste a title or caption to check it against every platform's limit and see where it gets cut off before "more".
- Characters
- 0
- Words
- 0
- Hashtags
- Lines
- 0
About these limits
Limits were last checked in September 2026. Platforms change them without much notice, so if a post won't publish, check the app. Instagram has been rolling out a limit of 5 hashtags per post since December 2025. TikTok allows longer captions in its app than through scheduling tools, so this checker uses the safer 2,200.
Apps count some characters differently. Emoji can count as more than one, and X counts links as 23 characters. Treat a caption that's right at the limit as over it.
Caption writer
Describe your post and get three caption options, hashtags and title ideas, in the language your audience speaks.
The caption writer isn't available on this version of the site.
Written by AI. Read every caption before you post it.
Your captions will appear here.
Getting better captions
Be specific. Say what happens in the video, who it's for, and anything you want mentioned, like a place, a product or a question for viewers. The writer only uses what you give it, so concrete details make the captions sound like you.
Hinglish captions mix Hindi and English in the Latin alphabet, the way many people text. They often read more naturally to Indian audiences than formal Hindi.